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            <a href="/categories/XJUSEC"><b>「
                </b>XJUSEC<b> 」</b></a>
            
            June 01, 2020
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            <a href="/2020/06/01/SMC%E4%BB%A3%E7%A0%81%E8%87%AA%E5%8A%A0%E5%AF%86/" title="SMC代码自加密" class="posttitle">SMC代码自加密</a></h3>
        
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            <span>
                <b class="iconfont icon-text2"></b> <i>Words count</i>
                405
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                1 mins.
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                <span class="leancloud-visitors-count">1000000</span>
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            <p>SMC（Self Modifying Code），即一种将可执行文件的数据或代码进行加密，以防止其他人使用逆向工具对程序进行静态分析，只有程序运行时才对代码和数据进行解密，从而正常运行程序和访问数据。某些计算机病毒也会采用SMC技术动态修改内存中可执行代码来达到变形或对代码加密的目的，从而绕过杀毒软件或者迷惑反病毒工作者对代码进行分析。由于该技术需要直接读写内存中机器码，多采用汇编实现。</p>

            
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                <a href="/categories/XJUSEC">
                  <b>「 </b>XJUSEC<b> 」</b>
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            May 06, 2020
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        <h3 class="post-title animated fadeInDown"><a href="/2020/05/06/Ollvm%E5%B9%B3%E5%9D%A6%E5%8C%96%E5%A4%84%E7%90%86%E7%9A%84%E6%81%A2%E5%A4%8D-%E7%AC%A6%E5%8F%B7%E6%89%A7%E8%A1%8C/" title="Ollvm平坦化处理的恢复-符号执行" class="posttitle">Ollvm平坦化处理的恢复-符号执行</a></h3>
        
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                        1.1k
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                        1 mins.
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                        <span class="leancloud-visitors-count">1000000</span>
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                <p>看到几篇关于Ollvm反平坦化的文章，先屯着过几天看</p>
<p><a href="https://zhuanlan.zhihu.com/p/99509681?from_voters_page=true" target="_blank" rel="noopener">https://zhuanlan.zhihu.com/p/99509681?from_voters_page=true</a></p>
<p><a href="https://security.tencent.com/index.php/blog/msg/112" target="_blank" rel="noopener">https://security.tencent.com/index.php/blog/msg/112</a></p>
<p><a href="https://blog.quarkslab.com/deobfuscation-recovering-an-ollvm-protected-program.html" target="_blank" rel="noopener">https://blog.quarkslab.com/deobfuscation-recovering-an-ollvm-protected-program.html</a></p>
<p><a href="https://bbs.pediy.com/thread-217727.htm" target="_blank" rel="noopener">https://bbs.pediy.com/thread...</a></p>
            
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                <a href="/categories/XJUSEC">
                  <b>「 </b>XJUSEC<b> 」</b>
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            March 27, 2020
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        <h3 class="post-title animated fadeInDown"><a href="/2020/03/27/MRCTF/" title="MRCTF" class="posttitle">MRCTF</a></h3>
        
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                    <span>
                        <b class="iconfont icon-text2"></b> <i>Words count</i>
                        14k
                    </span>
                
                
                    <span>
                        <b class="iconfont icon-timer__s"></b> <i>Reading time</i>
                        13 mins.
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                    <span id="/2020/03/27/MRCTF/" class="leancloud_visitors" data-flag-title="">
                        <b class="iconfont icon-read"></b> <i>Read count</i>
                        <span class="leancloud-visitors-count">1000000</span>
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                <ul class="animated fadeInDown post-tags-list" itemprop="keywords"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/CTF/" rel="tag">CTF</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/WP/" rel="tag">WP</a></li></ul>
            
        
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                <p>维吉尼亚唯密破解，从密文中分析词频。</p>
<pre><code class="python">#cipher = &#39;g vjganxsymda ux ylt vtvjttajwsgt bl udfteyhfgt oe btlc ckjwc qnxdta vbbwwrbrtlx su gnw nrshylwmpy cgwps, lum bipee ynecgy gk jaryz frs fzwjp, x puej jgbs udfteyhfgt, gnw sil uuej su zofi. sc okzfpu bl lmi uhzmwi, x ...</code></pre>
            
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                <a href="/categories/XJUSEC">
                  <b>「 </b>XJUSEC<b> 」</b>
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            March 27, 2020
        </p>
        <h3 class="post-title animated fadeInDown"><a href="/2020/03/27/%E6%98%93%E9%9C%96%E5%8D%9A-wp/" title="易霖博_wp" class="posttitle">易霖博_wp</a></h3>
        
            <p class="post-count animated fadeInDown">
                
                    <span>
                        <b class="iconfont icon-text2"></b> <i>Words count</i>
                        7k
                    </span>
                
                
                    <span>
                        <b class="iconfont icon-timer__s"></b> <i>Reading time</i>
                        6 mins.
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                    <span id="/2020/03/27/易霖博-wp/" class="leancloud_visitors" data-flag-title="">
                        <b class="iconfont icon-read"></b> <i>Read count</i>
                        <span class="leancloud-visitors-count">1000000</span>
                    </span>
                
            </p>
            
                <ul class="animated fadeInDown post-tags-list" itemprop="keywords"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/CTF/" rel="tag">CTF</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/WP/" rel="tag">WP</a></li></ul>
            
        
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                <p>easyRSA，打开文件是一个公钥文件和密文</p>
<p>打开公钥文件：</p>
<pre><code class="txt">n: 1609171776542445768447627776591461901319897552353129201616509204543307009012857087050366254626608170252781977743426970763513983948120169897640111998917765007189763150303114073942260814351222397309997386817233542861785621371767...</code></pre>
            
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                <a href="/categories/XJUSEC">
                  <b>「 </b>XJUSEC<b> 」</b>
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            March 14, 2020
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        <h3 class="post-title animated fadeInDown"><a href="/2020/03/14/BUU-wp/" title="BUU_wp" class="posttitle">BUU_wp</a></h3>
        
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                    <span>
                        <b class="iconfont icon-text2"></b> <i>Words count</i>
                        76k
                    </span>
                
                
                    <span>
                        <b class="iconfont icon-timer__s"></b> <i>Reading time</i>
                        1:09
                    </span>
                
                
                    <span id="/2020/03/14/BUU-wp/" class="leancloud_visitors" data-flag-title="">
                        <b class="iconfont icon-read"></b> <i>Read count</i>
                        <span class="leancloud-visitors-count">1000000</span>
                    </span>
                
            </p>
            
                <ul class="animated fadeInDown post-tags-list" itemprop="keywords"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/CTF/" rel="tag">CTF</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/WP/" rel="tag">WP</a></li></ul>
            
        
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                <p>今天开始刷buu计划，更新中···</p>
<hr>
<hr>
<h3 id="传统知识-古典密码"><a href="#传统知识-古典密码" class="headerlink" title="传统知识+古典密码"></a>传统知识+古典密码</h3><p>​        题目描述：</p>
<pre><code class="txt">小明某一天收到一封密信，信中写了几个不同的年份
          辛卯，癸巳，丙戌，辛未，庚辰，癸酉，己卯，癸巳。
          信的背面还写有“+甲子”，请解出这段密文。

key值：CTF{XXX}</code></pre>
<p>知识点：</p>
<p>六十甲子</p>
<p>甲、乙、丙、丁、戊、己、庚、辛、壬、癸被称为“十天干”，子、丑、寅、卯、辰、巳、午、未、申、酉、戌、亥叫作“十二地支”。</p>
<p>天干地支表</p>
<p></p>
<p>映射数字</p>
<p>28 30 23 8 17 10 16 30  </p>
<p>+甲子（题目的意思应该是一个周期，+60，...</p>
            
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                <a href="/categories/XJUSEC">
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            February 29, 2020
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        <h3 class="post-title animated fadeInDown"><a href="/2020/02/29/V-N2020%E5%85%AC%E5%BC%80%E8%B5%9B%E9%83%A8%E5%88%86re/" title="V&amp;N2020公开赛" class="posttitle">V&amp;N2020公开赛</a></h3>
        
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                    <span>
                        <b class="iconfont icon-text2"></b> <i>Words count</i>
                        7.4k
                    </span>
                
                
                    <span>
                        <b class="iconfont icon-timer__s"></b> <i>Reading time</i>
                        7 mins.
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                    <span id="/2020/02/29/V-N2020公开赛部分re/" class="leancloud_visitors" data-flag-title="">
                        <b class="iconfont icon-read"></b> <i>Read count</i>
                        <span class="leancloud-visitors-count">1000000</span>
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                <ul class="animated fadeInDown post-tags-list" itemprop="keywords"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/CTF/" rel="tag">CTF</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/WP/" rel="tag">WP</a></li></ul>
            
        
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                <p>题目是个cpp程序，打开后可以运行，读了一遍我的环境变量就没了。。。</p>
<p>查壳，没有，拖入ida，进入String窗口，跟踪flag进入函数；</p>
<pre><code class="txt">.rdata:000000014001DCC0    00000009    C    _ArgList
.rdata:000000014001DE00    00000008    C    sysInfo
.rdata:000000014001DE60    00000014    C    ok,I am checking...
.rdata:000000014001DF08    0000001D    C    flag...</code></pre>
            
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                <a href="/categories/XJUSEC">
                  <b>「 </b>XJUSEC<b> 」</b>
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            February 15, 2020
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        <h3 class="post-title animated fadeInDown"><a href="/2020/02/15/XJUSEC2019%E6%96%B0%E7%94%9F%E8%B5%9BWP/" title="XJUSEC2019新生赛WP" class="posttitle">XJUSEC2019新生赛WP</a></h3>
        
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                    <span>
                        <b class="iconfont icon-text2"></b> <i>Words count</i>
                        17k
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                        16 mins.
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                        <b class="iconfont icon-read"></b> <i>Read count</i>
                        <span class="leancloud-visitors-count">1000000</span>
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                <ul class="animated fadeInDown post-tags-list" itemprop="keywords"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/CTF/" rel="tag">CTF</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/WP/" rel="tag">WP</a></li></ul>
            
        
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                <p>关于XJUSEC2019新生赛的一些源码与WP</p>
<p>源码我会放在我的仓库里，WP的话会给出本次crypto方向上的做题思路</p>
<h3 id="0x01-truelove"><a href="#0x01-truelove" class="headerlink" title="0x01  truelove"></a>0x01  truelove</h3><ol>
<li><p>本题为一道娱乐题目，希望大家在做题的同时对密码学产生兴趣，并没有涉及加密原理，只是借用了火狐Mozilla的一个网页信息加密小游戏<a href="http://https://codemoji.org/" target="_blank" rel="noopener">Codemoji</a></p>
</li>
<li><p>接下来是题解，没有文件，点开是一段base64，很常见的加密，在线解base</p>
</li>
<li><p>很明显的一个网站，后面是信息提示，也就是有关解密所需KEY的提示信息，真爱的颜色，因为是一道娱乐题，<del>玩梗也是情有可原</del>（误，...</p></li></ol>
            
            <span class="read-more"><a href="/2020/02/15/XJUSEC2019%E6%96%B0%E7%94%9F%E8%B5%9BWP/" title="Read article" class="posttitle">Read article</a> <b class="iconfont icon-arrow-right- gradient-text"></b></span>
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